Signature of the Gluon Orbital Angular Momentum
Shohini Bhattacharya, Renaud Boussarie, Yoshitaka Hatta
Abstract
We propose a novel observable for the experimental detection of the gluon orbital angular momentum (OAM) that constitutes the proton spin sum rule. We consider longitudinal double spin asymmetry in exclusive dijet production in electron-proton scattering and demonstrate that the cosϕ azimuthal angle correlation between the scattered electron and proton is a sensitive probe of the gluon OAM at small x and its interplay with the gluon helicity. We also present a numerical estimate of the cross section for the kinematics of the Electron-Ion Collider.
Topics & Concepts
PhysicsHelicityGluonColliderParticle physicsAngular momentumAsymmetrySpin (aerodynamics)ElectronProtonNuclear physicsScatteringObservableProton spin crisisCross section (physics)AzimuthQuantum mechanicsQuarkOpticsThermodynamicsParticle physics theoretical and experimental studiesHigh-Energy Particle Collisions ResearchQuantum Chromodynamics and Particle Interactions